Shock-absorber.



H. B. STANTON. $11001: ABSORBER. APPLICATION FILED AUG. 8, 1910.

Patented June 4, 1912.

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HORACE B. STANTON, OF BOSTON, MASSACHUSETTS.

SHOCK-ABSORBER.

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Specification of Letters Patent.

Patented June 11912.

Application filed August 8, 1910. Serial No. 576,066.

To all whomit may concern:

Be it known that I. IIORACE B. STANTON, a citizen of the I -nitedStates. and a resident of Bostoinin the county of Suffolk and State ofMassachusetts, have invented new and useful Improvements inShock-Absorbers, of which the following is aspecification.

section-of a shock-absorber embodying one form of my invention; Fig. 2is a fragmentary lon'gitudinalcentral section illustrating .a modifiedform of the invention; Flg. 3 1s a detail, view in plan of amodification of one of the auxiliary pistons; and Fig. l is a secvtional view on line 44 of Fig. 3.

A represents a cylinder provided with the closed. ends or heads a and a,the latter be ing provided with a suitable ring or eye'a adapted 'to besecured to-the axle of a vehicle.

B is the main piston secured fast to the piston rod 12, which passesthrough a suit able stuffing box b in headrnand is provided with a ringor eye 6 for attachment to the body of the vehicle.

The piston B is made -with one or more holes 6 forming passagestherethrough.

At opposite sides of the mainpiston B are the two auxiliary pistons Cand C, each provided with holes c'forming passages reg istering with theholes b of the main piston but of smaller area than the holes 6 Eachauxiliary piston C and C is movable rlatively to the main piston B, andis yieldingly held apart from the main piston by springs In the formshown in Fig. 1, promovement-of the piston C. The piston C is providedwith a hubc", which has a slidingfit with piston rod b',-and ispreferably recessed on its under side to receive one end of coil spring8, the other end of which abutsagainst the main. cylinder B. Spring 8and auxiliary piston C apart. The other auxiliary piston C is providedwith a num ber of headed pins 0 which extend through and slide inperforations in the main piston B. The heads of pins 6; limit themovement of piston C away from the main pistends normally to urge themain piston B ton, and coil springs s, which are'held between the mainpiston and auxiliary piston I C, tend normally to urge said pistonsapart, the upper ends of said springs .9 being held in recesses providedtherefor in the under side of piston B.

In the modification shown in Fig. 2, the main piston B and the upperauxiliary piston C, are the same as in Fig. 1. The lower auxiliarypistion C instead of being mounted to slide with" relation to the mainpiston by means of pins o is mounted to slide on an extension of pistonrod Z), and is identical in all respects with the upper auxiliary piston G. hen this form of lower auxiliary piston is used, the conical orconcave form of cylinder head (4 becomes particularly important as itaffords a space for the protruding hub c and nut (Z at the end of thepiston *rod. In either form it will be seen that while the two auxiliarypistons and the main piston are relatively movable, nevertheless theyare all carried by the piston rod 6 and are movable together as onepart.

The cylinder A is filled with a suitable oil, or glycerin, 01' 'othersuitable fluid, preferably non-congealable. e

The large passages b in the main piston B permit a certain amount ofcomparatively free and unrestrained. movement of piston B between thetwo auxiliary pistons,-sutliciently free, so that the relative movementofthe cylinder and piston is not emphatically checked, during shortstrokes of the piston resulting from the ordinary vibration of thevehicle or slight inequalities of the road, nor during the first part ofa long stroke, resulting from more pronounced inequalities of the road.During the latter part of along stroke in either direction the mainpiston is forced againstone or the other of the auxiliary pistons,depending strained owing to the relatively small pas-v ,upon' thedirection of movement ofthe main A is doing the work and bearing thepressure,

through the auxiliary sages through the auxiliary piston. As theauxiliary piston, whichfor the time being devised the structure shown inFigs. 3 and 4, wherein 6 represents a valve in theform of a plate ordisk lying against the disk or piston C and mounted to turn on hub c.

The disk e is provided with holes 6, arranged to register with theholes0 of piston C, and with slots e through which pass the headed screws 6which are set in disk C.

When screws e are loosened the disk 6.

may be given the desired angular adjust- I ment partially to close thepassages c, after which by turning up the screws the diske maybesecured-in adjusted position. Both auxiliary pistons may be providedwith such adjustable *disks if desired, so as, to

regulate the checking or restraint of the stroke in either directionindependently of the other.

I claim: 1. A shock-absorber comprising a cylinder, a main piston havingpassages therethrough, and two auxiliary pistons, one at each sideofjthe main piston, said main piston being movable relatively to theauxiary pistons, and said auxiliary pistons having passages'therethrough of smaller area thanthe passages of the main piston andbeingadapted partially to restrain the latter part ofthe movement of themain piston in each direction; v

2. A shock-absorber comprising a cylinder, a main piston having passagestherethr'ough, and two auxiliary pistons, one at each side of the mainpiston, said main piston being movable relatively to the auxiliarypi'stons,and all ofsaid pistons being movable together as one part, saidauxiliary :pistons having passages therethrough of smaller area than thepassages of the main piston and being adapted partially to restrain thelatter part of the movement of the main piston in each direction.

t 3. A shock-absorber comprising a cylinder, a main piston havingpassages therethrough, two auxiliary pistons, one at each side of themain piston, and a piston rod carrying all of said pistons, saidauxiliary pistons -mounted to slide longitudinally with relation to saidpiston rod and having passages therethrough of smaller area than the passages of the main piston and being adapted partially to restrain thelatter part of" the movement of the main piston in each direction.

- 4. A shock-absorber comprising a cylinder, a main piston havingpassages therethrough, and two auxiliary pistons one at each side of themain piston, said main piston being movable relatively to the auxil;iary pistons, and said auxiliary pistons having passages therethrough ofsmaller area than the passages of the main piston and being adaptedpartially to restrain the latter part of the movement of the main pistonin each direction, and'means to .vary the area of the passages throughone at least of said auxiliary pistons.

5. A shockabsorber comprising a cylinder, a piston rod, a main piston onthe piston rod, having passages therethrough,

and two auxiliary pistons one at each side of the main piston, saidauxiliary pistons,

having passages therethrough of smaller area' thanthepassages of themain piston, one of said auxiliaryepistons being mounted to slide onsaid piston rod, and the other being provided with pins adapted toslide.

through the main piston.

6. A shock-absorber comprlsing acyl'-' inder, a main piston havingpassages therethrough, two auxiliary pistons one at each side of themain piston, and a piston rod carrying all of said pistons, "saidauxiliary pistons mounted to slide longitudinally with relation to saidpiston rod and having passages therethrough of smaller area than'thepassages of the main piston and being adapted'partially to restrain thelatter part of the movement of the main piston in each direction, andsprings normally urging each of said auxiliary pistons away -fromsaidinain piston.

7, A shock-absorber comprising a cylinder, a main pistonhaving passagestherethrough, two auxiliarypistoiis one at each A side of the mainpiston, and a piston rod carrying all of said pistons, said auxiliarypistons mounted to slide longitudinally with relation to said piston.rod and having pa"s.

sages therethrough of smaller area than the passages of the main pistonand being adapted partially to restrain the latter part. of the movementof the main piston in each direction, each of said auxiliary pistonsduring its operative stroke adapted to lie against and transmit itsstrain to said main. piston.

Signed by me at Boston, .Massachusetts this twenty-ninth day-of July1910.

' HORACE B. STANTON.

- Witnesses:

ROBERT CUsnMAN, CHARLES 1D. Woonnnnnr,

